Follow these detailed steps to create your Lime Mousse Cheesecake:

1. Preheat the Oven: Preheat your oven to 325°F (160°C).
2. Prepare the Crust: In a bowl, combine graham cracker crumbs and melted butter. Mix until well combined.
3. Press the Crust: Firmly press the mixture into the bottom of a 9-inch springform pan to form a crust. Bake in the preheated oven for 10 minutes. Remove and allow to cool.
4. Beat the Cream Cheese: In a large mixing bowl, beat the softened cream cheese until smooth and creamy.
5. Add Sugar: Gradually add granulated sugar into the cream cheese while mixing until it’s fully incorporated.
6. Incorporate Eggs: Add the eggs one by one, mixing thoroughly after each addition. Ensure the mixture is smooth and creamy.
7. Add Lime Juice and Zest: Stir in the fresh lime juice and lime zest until evenly mixed.
8. Pour the Filling over the Crust: Carefully pour the cheesecake batter over the cooled crust, smoothing the top with a spatula.
9. Bake the Cheesecake: Place the springform pan in the oven and bake for about 50-60 minutes. The center should slightly jiggle but appear set.
10. Cool the Cheesecake: Once done, turn off the oven and leave the cheesecake inside with the door ajar for about 1 hour. This helps prevent cracking.
11. Chill the Cheesecake: Transfer the cheesecake to the refrigerator and chill for at least 3 hours, ideally overnight.
12. Prepare the Mousse Topping: In a separate bowl, whip the heavy cream with powdered sugar until soft peaks form.
13. Fold in Lime Juice: Gently fold in 1/3 cup of fresh lime juice into the whipped cream.
14. Top the Cheesecake: Once the cheesecake is chilled, spread the lime mousse topping evenly over the cake.
15. Garnish: Decorate with fresh lime slices and mint leaves if desired.
16. Slice and Enjoy: Carefully remove the sides of the springform pan and slice the cheesecake for serving.

These detailed steps guide you through creating a spectacular Lime Mousse Cheesecake with ease.